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Old 06-11-2015, 10:32 AM   #1
EmbeddedSteve
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pktgen setup


Greetings,
I've got some questions related to the Linux Tool: pktgen
I have networking experience, though never used this tool much. I understand the concepts of packet generation, etc (having done it the hard way back in the day of 10 MB coax NIC's).
From what I read the kernel generation, it says there is 1 thread per core "per device" - I assume that "device" == a single ethernet port?
I'm finding limitation in trying to run multiple ports (on I/O cards in an embedded chassis type setup). Tried 8 ports, with a 6 core CPU, but only 6 ports ran. So if the 1:1 is true, how can I test more ports??? Is there a way to add more devices to reach core? Or somehow get more threads running to which I can attach more ports?
Is there something else (saw Nping??) that might be more suitable for many port stress testing???
TIA for your feedback!
Regards,
Stephen
 
Old 06-13-2015, 09:49 PM   #2
berndbausch
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Quote:
Originally Posted by EmbeddedSteve View Post
Greetings,
I've got some questions related to the Linux Tool: pktgen
(...)
From what I read the kernel generation, it says there is 1 thread per core "per device" - I assume that "device" == a single ethernet port?
There is a white paper discussing pktgen, found here for example: http://www.cs.columbia.edu/~nahum/w6...5v2-pktgen.pdf.

Not having read through it, I don't know how it can be done, but it is obviously possible to have one pktgen thread control more than one NIC. Quote: "The main goal is to have one pktgen thread per CPU which can then drive one or more NICs."

Good luck!
 
Old 06-15-2015, 10:42 AM   #3
EmbeddedSteve
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@berndbaush - yes, I saw this paper, but it's from 2005, a bit dated. . . I'll take a closer look.
I can somewhat agree with the "1 thread per port" concept, but this becomes limited when the # of ports is much greater than the number of cores you have. . .
Thanks!
 
  


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